Comment by mercer

While I see some value in the red-green unit testing approach, I've found the drawbacks to often eclipse the advantages, especially under real-world time constraints.

In my day to day programming, when I neglect writing tests, the regret is always about those that are on the side of integration testing. I'm okay with not testing individual functions or individual modules even. But the stuff that 'integrates' various modules/concerns is almost always worth writing tests for.